chapter 49 key term
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| artifact | Any irrelevant object or mark observed when examining specimens or graphic records that is not related to the object being examined—for example, a foreign object visible through a microscope or an erroneous mark on an ECG strip.
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| cardiac cycle | The sequence of contraction and relaxation that makes up a complete heartbeat
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| depolarization | The loss of polarity, or opposite charges inside and outside; the electrical impulse that initiates a chain reaction resulting in contraction.
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| dysrhythmia | An irregularity in heart rhythm; also called arrhythmia.
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| electrode | sensor that detects electrical activity
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| forced vital capacity (FVC) | the greatest volume of air that a person is able to expel when performing rapid forced expiration
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| Holter monitor | An electrocardiography device that includes a microchip
or a small cassette recorder worn around a patient's waist or on a shoulder strap to record the heart's electrical activity
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| pulmonary function test | A test that evaluates a patient’s lung volume and capacity; used to detect and diagnose pulmonary problems or to monitor certain respiratory disorders and evaluate the effectiveness of treatment.
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| rhythm strip | An ECG tracing obtained using an electrocardiograph machine
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| spirometry | a test used to measure breathing capacity
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| hypoxemia | low levels of oxygen in your blood
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